i am setting up gentoo a Raspberry (B) following the gentoo wiki ,
first i prepare the SD-Card. The wiki links to the instructions over at
embedded linux wiki .
I wonder about the disk layout.
Q1: Do i need a swap partition, and if yes is 512m ok?
The gentoo wiki creates one, the elinux wiki not.
Q2: Also the Raspberry is likely to be powered down without warning. To
my belief jounarled filesystems can handle this. I plan to use JFS since
it works well on my desktop as well. Is there something I could have in
Q3: The gentoo wiki briefly mentions to use squashfs for /usr/portage.
What will be the benefits of this?
well i have set my Raspberry (B) with ArchLinuxArm. I decided againts
gentoo, because of the long compilling time (for example git takes a long
time). Maybe i try gentoo on my second sd card...
A1: I have set an extra swap partition. I followed this guide for resizing
my main partition (i have a 16 GB sd card class 10) and setting the wap
partition (or rather swap file?): Raspberry Pi – Partition an größere
Sd-Karte anpassen 
It is in german, but i think that if you are using gentoo, you should be
able to follow just the commands, knowing what they do.
I am not sure, how much swap you need, because you maybe need space for
compilation of programs. Because of this fact i would encourage you to set
a swap. How much swap you need/can give depends on the sd card. (I
wouldnt't make 1GB swap on a 4GB card).
I look forward to hearing more of you, because there are not that many
people, talking about gentoo on raspberry (or rather i didn't found many).
Can't answer A2, and A3, not enough knowledge.
 Setup Partitions on Raspberry
using 256M - doesnt use it much but it currently just plays videos on
Be careful using ext file systems and stock 4G cards - runs out of
inodes on large compiles. I installed from a gentoo image off the net
and rebuilt it. When I get time I'll do my own from scratch but its